OmniFocus is described as «is designed to quickly capture your thoughts and ideas to store, manage, and help you process them into actionable to-do items» and is a very popular todo list manager in the office & productivity category. There are more than 100 alternatives to OmniFocus for a variety of platforms, including iPhone, Online / Web-based, Android, iPad and Mac. The best alternative is Todoist, which is free. Other great apps like OmniFocus are Quire, WorkFlowy, Asana and TickTick.OmniFocus alternatives are mainly Todo List Managers but may also be Task Management Tools or Project Management Tools. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of OmniFocus.
